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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccbe57ef45e4f416220590b75ea1e0fa64d306420b30bf9179f901c2265cb3a' 
  AND token = '4fp7I8zBqo2zRThaIYo9j8UPOBIKiig7KPS0nlAOXII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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