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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9f240085e4d2700fa5338881ceb1165af70fea30aa1c453131269614b8011c' 
  AND token = '9yd9sef0smGG4YvtOfs7n3sPyQhz9kGq+LcQLvjG0uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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