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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3517bd57d54a22d75e91a6bbb26db15c74d4e1dd817665bc480c76e8e027866a' 
  AND token = '2SNrhh+OAaFILN+Xbtv3fp2gwkYozD71biYrN0P9Nuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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