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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda372d81ad14acbff713e6212a2dbd05f54d64a2950f2fd3577953ca15b3774' 
  AND token = 'jCtvxzxnRzLs2vrnVjfGtUTB1c1Uh1mMhbjJfS1ZMes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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