Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8059b8e8f0424f7e5d491001834a1c7e1e1a96a76a70541cd2d21438b5bd048e' 
  AND token = 'QAiLZtIVQazXQ1SkNr9vgzG3doueafZBvbr/H29sJgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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