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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281c07d4aaa5ae0bc5128d9198b146783d6d1d58a34a4c0530a4bfd3baef43eb' 
  AND token = 'vSm5K+a6V3HW5uAkEJR6wvTUy1lNBTUNrFE8Zubd1Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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