SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbd3da41c2b06da2b4885f155487a80d85599965b2399cc64081768c6f6e81a' 
  AND token = 'W5zM68r/73grAlB+UlRzoJl5U+wsM3W8pYq2l3LUYqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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