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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94077e0cfab15692fe171d22e7d396376ed16e348969c75731816cb8775b4b6' 
  AND token = 'DeCx8x8J6QmYEpGV+xdK36HqA4DJ8hXkO3G2qaFXJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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