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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9161c0b0348d9bcef42226a07319c5da583ce881cb3f7d3779b9b8800a67f92d' 
  AND token = 'fJHrFpm66A8dXshRmh/t+241BuTFgMOE6KwLqeaXqA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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