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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb6005413425349b0e0d6b484d034b9c6e7fa3860a0009fd1e6fe62d11ef0dc' 
  AND token = 'WawMYJcw/vm3I179QgzBWV7yYnGrbY9dYMHiaIIxhog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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