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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43be8ce7b76c54fd23c38aec53a7ed75318a3722957733004b89606d30ecff31' 
  AND token = 'CGurPsN3oDTZH9plQNaqf6wYxC8+5Ful3jUmQOM7P74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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