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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b3e18bd2df8847dd81c585082dff1e2ab275128c421fc7316daa5a9dac5c7c' 
  AND token = '87XklV1gqU7zktJJcG7ZoAdQ7NSpUGRi74K8WE0XBK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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