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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9a278eab45cc9805b4b3b606d7ed9703bbab505762028c48a9ddbce52014e0' 
  AND token = '+0RcG8Ifyd122ruJ6QBDW8esrApdVtf+ELOrya62kIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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