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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84f74851d9261f7961de1f5403cee3ceac1beee0bc02b6577d1604e1d3e7150' 
  AND token = 'YG4qOSe48xJ/7SHfWMY15JXdnFzWJH0a/CVDe0P+4bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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