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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ed8218e857467fc0a4ebb8dbcb6ebb3fe9b7add1455c5a57099ea95a31abb9' 
  AND token = '2O12jL3jTzuYbJyJx2rV/z8e643lIF+0eDYyMfL07Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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