SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461d6f759187fa49db966bd48c91788265e8b356130ef247d6c12cc81280cc74' 
  AND token = 'FleZtK1J1Jasmyz/vCa3n7lUT/61mpzpGqUULMGFgeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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