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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bc407d98ef1c530d4a1ce6eb663f73076bf0704f6940b319cfdefeac1b48e8' 
  AND token = '9X6ZJOlf7pRUA2j4gCektEEEBEjiLGEcWql4CorMfDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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