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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09d9d471973c84feb5fc3a315f8399285ce5f156295442f855f67ef1387f55a' 
  AND token = '+kyvrFZSuT5qwoy7GgXUEtfS9/L0TElPYrfNgYSeTi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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