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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036421c023131b73ad7432e1ff8d5107ce1b5e6a670f418e995cd8412a5e79c6' 
  AND token = 'VxWong+uDEv7J4Qoq0UEWIQ4qfM4aqu93Msns3TF6SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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