Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59feadc43ba0c511740db9e30eec07ff13edad4cacd8e49ee7034b62b7cb55f2' 
  AND token = '0DxY5ytofQifgj6eLqf+IDAqnMzlouQyb8OP5IAOhXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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