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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f92b85bcffb8ec898e6e6e0ee82d1270f91d6316501accf0f977e705db6d91' 
  AND token = 'j7H/gpT7WK2OtRT55seFlOKULw5aAsXeWRW7dUdK9Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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