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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f592b2b13f860307f7a4b2402541e79e7b4811433b1c4785573b0cbc1e04b82' 
  AND token = 'Hmgc8KBl0nTW7TbqYcosxL295r5bQYQ84r0EU8GQyKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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