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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b11e8365c1cde3cc3a14492dda55a990459a559a565c57ff4c3fa8e4f96884' 
  AND token = 'tKco2wjTyKFssISwZEJs8jq7Ir+EoaEVPnkO8hy1iKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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