Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e1dc920280e1a5605cb176646a9d06935ef370df89afed41431bf97dcfe80a' 
  AND token = 'QjAXNsXE7IiRTLXDcXzOwI6YEb58nQgJ4YscXtdmUKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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