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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482cb582c8e723164926dc18dff4126b9796c6861dfced935a59c751aec1988f' 
  AND token = 'JUTfv87/Gj7e1h9e14Tf8w2jd68NeDhpO/DM6JUg1V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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