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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac5d16b7170a594342c5cdd1fb08fac757b7350489273df70afc5acb9377204' 
  AND token = 'lU1lJjCXQRPA7J23c5lxKLTfXOopryjBJsocGHmEVYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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