Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78fbb1d589eec57b7f3b6db65095046eb901a5bbed312ee80bd3ad12e0ad1df' 
  AND token = 'ie6fDHJs31UKjKkmrF6EAC8F2KCw36VdTjSkizkPgK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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