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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3b4a6b97d19375969ce0058c454300592edff06e1cf30dd56c4384fdefa8f4' 
  AND token = 'd7EpFKcnY/iOaKFCjgNkX/c7NB0m9vhxtIC8klaL/N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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