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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fa176f3c2346eb7dbe460c8a01b5bda3ad128e641803d0f7408785500880a4' 
  AND token = 'WLVE3keiJOhiJhl9YYhAjAcgWVw8p/kPs0InIDSc9i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}