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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4bfa9b3499fd34b053cbba5877bd4ce515ff3c58d0f0525f44e64af858913b' 
  AND token = 'HH+sWQ7CKD7d+00V9K/6wYtvUaf4gz/T2h9EtLyVpn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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