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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef0b259b2349da837baf5d3e2abc8109f4f970991dbc3020befb6898e82b9ea' 
  AND token = 'LCVA1kl3EcNeOyCBYuIwnCAQUd7H4KdbNNJ6sOkcPEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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