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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a1152ee7d77b5fa53d038a7d374f095224ecb14a4e05ebf635f417d24dae67' 
  AND token = '7trMz+z/Ui3oYQnf3hCStGSQ+mJ3h0vzCfAdaU5I7Wc=' 
  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"
    }
  }
}