Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e951e830dbdd5ce6625676a09c35a8810efc767f4b4b0b9bc5b5d372d2241c' 
  AND token = 'bsWpcnzVsDWkvTGhexb4kEUOHviz/aF+mlV9Z57AUQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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