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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e570988983c13329ec92e0c151d83249045c930e0c1957c3b33ee41accaf7235' 
  AND token = '6yNoqP7wmvxtAE8foqDuq4jI1r18bwjqIGxxTJa8w1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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