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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fedc511cee0a30b679dbc609822ef22fd1efc34d37f5b9b4e02716383421805' 
  AND token = 'gtna00Wi1CeUYT50Wikb1lGbrBjDCIqJIjzTzF4iItA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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