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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a69aed22204b2d4c0ab23f73c1c86c28345975a5cd7e490b3ff9cb436c08f54' 
  AND token = '7h46L0vCauHye/7pPLl298NLp/WmZx0V6E1cUcY0068=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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