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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaebce336ec96533b59e42769ee2aae6968c8541714d12e6c98ac93b2d3cfca' 
  AND token = '3U//a4iPNLkVteKzPc27tOJfNQaHLJgScW6HSVUHD00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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