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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3b4a3f4c6a7a7ea7e1ed1711dd0d8b876fb914936b9eb43ffdde8c17695098' 
  AND token = 'T8W3aU5WkgyTJ9abUPBKBdsKnU/ZqHev857lRRSgUUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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