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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0407fd68c52368ef2bc7259ee0464828a7692da770648d92c6a216a276bd4b1' 
  AND token = 'tov/zQnTmtv3BsiIXtiWXKNTVt8FRJWVjkiQ8ATdyZk=' 
  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"
    }
  }
}