SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3405cb216d8735a53a0fd985a56f24ee72bc3c0c900102d6345d21ffbeb6f37e' 
  AND token = 'sJvZ51wE/FU4VBzKZ6yIc18Y8APGr+ClMTHbE524taY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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