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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fa6a4dc4b21d9824479471c6776748586e21c1ba88c358ed4183d1cf7079ac' 
  AND token = 'sauMILfzT39+5BESg8QlajjB3lIG2k/xoaivU2mxN5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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