Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f4731c4c6d493b36f24592877a51c0989568b829144bc326c2f580231f8433' 
  AND token = 'rMII0eizH76NYnptf3EB3CZ6YfPh4NwxN37BQhyv0Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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