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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3464e17d61f29eba45fc247d45e6f346a47aadf41e926d19435771dddd7e3438' 
  AND token = 'waiWhxmvf9WnkSO5NIP9kbGQERUZ0hRo4mAUJsRPavY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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