Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9926030ede1a49834486e7fc4da98aafe3cf86a8dee379c35a883d1ce52f2d5b' 
  AND token = '42IQol25y6c7yRifYdBcD1GKaNhQJHC0yh8ntYFEm98=' 
  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"
    }
  }
}