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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae2ffce347486223cf8459867189438eaec6f8cdfe3da4a1bfcdea0db105e49' 
  AND token = 'c1Rjq1pv2nvrNJQyAB0vI0WzM6JMzF2h7Jjqq69ZNNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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