SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0466b88494537bc2d2b5295dfa9cf632d381e83c2ff1a51a19d0714f6e704d78' 
  AND token = 'xCy3Ie0mBeLPSbvFt575hN1nZuwjA5WZlSOgSv+rJFg=' 
  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"
    }
  }
}