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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a0aae7c214bc79b84691e5e39262f05ab329d98cd9695b10afceba1ba65cb0' 
  AND token = 'EO7l7YQ0pMNyBCMJe9Tgk7fsJCAWUAHN7CNckDQLBYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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