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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dc7f1fee3001216b7c647572ebc94534bb29158fefc2e90356ad1d762c9bfa' 
  AND token = '5HzBha89FSlRFou+ZdFzO51/3hIGARM1qLacnaY7n0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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