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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff71c727faa070b500e465c4ea97499e3cda9bbee668d3e6de27a7a3609e62e' 
  AND token = '8Ry4QSjvS37/zCReaZF/VF8RvJdjoPohG+Usm1zqHtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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