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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2303f9867275446e0c83eee3dc478fb894292e9953adc14826f7af2b8aba79' 
  AND token = '7dDH7+Iu8wc55tHT7eM7LYEq8wMZKMlFfP/QyIMUdCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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