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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dfd21b64e7b581606de832f392e8a4572691c1a4a5bdf5d81fc904a53f0853' 
  AND token = 'uklVI7MWvFD47hgH9MQeG9OJGr2jCEMur9r/6DykIVU=' 
  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"
    }
  }
}