Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292d434bd9678ec28efc2a68a98f33d565f3b13ef4c9350e8b86c4aa16e2c545' 
  AND token = '5ZkkPbpg9lH86dqLwscyQ1Mzp7ziEoQEQmiGwdS5UOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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