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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8395c1a02dee8339b1bb61d82fa4a5bf104f53cd91f7d9bd11f4e19ef5bad7' 
  AND token = 'VbVGX6ilpBCl5ftM9b8Tg5Hbq8qhBTmLxV+a9TEZu24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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