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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91f36a6d83ce136dc07f1e3f246ae6ee4dc77a317610c2bf36c548a42be12ed' 
  AND token = 'Ljjr4Ww043laZS7UyiqIi+eijHs1FqL1rIW/dee56fE=' 
  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"
    }
  }
}