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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09f1ea9eb11d9f9c5fb3ca4cbeb665aaec706bfab60fb16a19d997e38a896c4' 
  AND token = '3CXyjhh/9+R9ezjoMeqFQfBT857TEh4gmt+8zcjlVHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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