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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603ddb8a2b85e213fc2f62955f225d146ab50454d4b3e15060b3b94a23156c8c' 
  AND token = 'I6FZWAplW/MgYZl2Q3XGLN89TlbstjtIIeS5W9YUB3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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