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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db5c2efc0536ce9b449917d07cd14a316d6987dac6cda44bbd11f35b9f22e6e' 
  AND token = '2CkM0ASIcuwMci3LR8dvcasp/kbC7avyZ9qKb8I0gso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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