Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b366d2fe593fde0422b1dcc8a82e112df06d61535448e81fc20cc35f12053a76' 
  AND token = 'RvULDinpcgFmpKkUlOWM405Vq7162JX19GJsoVcJduo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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