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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b023c0246fdf6aa3f4967a75589bb9f03207f4a26b4326d98ccc8e70a44e87c0' 
  AND token = 'qs7XHKSXGxIYz9/IasLAAC9U6taC/8UafSqmH2NYQFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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