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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a47737fae7afdc4c163f3db7013beaa13eb13bec656c9a8643bb49655b6bb06' 
  AND token = '3kFJ957UJxtJnGL/pemc+tYBI/zKSt3M/3JFVhm3/aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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